package com.beiming.libra.common.utils;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;
import org.apache.commons.codec.binary.Base64;


public class ZXingCode {

  private static final int QRCOLOR = 0xFF000000;   //默认是黑色
  private static final int BGWHITE = 0xFFFFFFFF;   //背景颜色


  public static void main(String[] args) throws WriterException {
    try {
      getLogoQRCode("https://www.baidu.com/", "跳转到百度的二维码");
    } catch (Exception e) {
      e.printStackTrace();
    }
  }


  /**
   * 生成带logo的二维码图片
   */
  public static String getLogoQRCode(String qrUrl, String productName) {
//      String filePath = (javax.servlet.http.HttpServletRequest)request.getSession().getServletContext().getRealPath("/") + "resources/images/logoImages/llhlogo.png";
    //filePath是二维码logo的路径，但是实际中我们是放在项目的某个路径下面的，所以路径用上面的，把下面的注释就好
    String filePath = "/Users/xiet/Pictures/59364982.jpg";  //TODO
    String content = qrUrl;
    try {
      ZXingCode zp = new ZXingCode();
      BufferedImage bim = zp.getQRCodeBufferedImage(content, BarcodeFormat.QR_CODE, 400, 400,
          zp.getDecodeHintType());
      return zp.addLogoQRCode(bim, new File(filePath), new LogoConfig(), productName);
    } catch (Exception e) {
      e.printStackTrace();
    }
    return null;
  }

  /**
   * 给二维码图片添加Logo
   */
  public String addLogoQRCode(BufferedImage bim, File logoPic, LogoConfig logoConfig,
      String productName) {
    try {
      /**
       * 读取二维码图片，并构建绘图对象
       */
      BufferedImage image = bim;
      Graphics2D g = image.createGraphics();

      /**
       * 读取Logo图片
       */
      BufferedImage logo = ImageIO.read(logoPic);
      /**
       * 设置logo的大小,本人设置为二维码图片的20%,因为过大会盖掉二维码
       */
      int widthLogo = logo.getWidth(null) > image.getWidth() * 3 / 10 ? (image.getWidth() * 3 / 10)
          : logo.getWidth(null);
      int heightLogo =
          logo.getHeight(null) > image.getHeight() * 3 / 10 ? (image.getHeight() * 3 / 10)
              : logo.getWidth(null);

      /**
       * logo放在中心
       */
      int x = (image.getWidth() - widthLogo) / 2;
      int y = (image.getHeight() - heightLogo) / 2;
      /**
       * logo放在右下角
       *  int x = (image.getWidth() - widthLogo);
       *  int y = (image.getHeight() - heightLogo);
       */

      //开始绘制图片
      g.drawImage(logo, x, y, widthLogo, heightLogo, null);
//            g.drawRoundRect(x, y, widthLogo, heightLogo, 15, 15);
//            g.setStroke(new BasicStroke(logoConfig.getBorder()));
//            g.setColor(logoConfig.getBorderColor());
//            g.drawRect(x, y, widthLogo, heightLogo);
      g.dispose();

      //把商品名称添加上去，商品名称不要太长哦，这里最多支持两行。太长就会自动截取啦
      if (productName != null && !"".equals(productName)) {
        //新的图片，把带logo的二维码下面加上文字
        BufferedImage outImage = new BufferedImage(400, 445, BufferedImage.TYPE_4BYTE_ABGR);
        Graphics2D outg = outImage.createGraphics();
        //画二维码到新的面板
        outg.drawImage(image, 0, 0, image.getWidth(), image.getHeight(), null);
        //画文字到新的面板
        outg.setColor(Color.BLACK);
        outg.setFont(new Font("宋体", Font.BOLD, 30)); //字体、字型、字号
        int strWidth = outg.getFontMetrics().stringWidth(productName);
        if (strWidth > 399) {
//                  //长度过长就截取前面部分
//                  outg.drawString(productName, 0, image.getHeight() + (outImage.getHeight() - image.getHeight())/2 + 5 ); //画文字
          //长度过长就换行
          String productName1 = productName.substring(0, productName.length() / 2);
          String productName2 = productName
              .substring(productName.length() / 2, productName.length());
          int strWidth1 = outg.getFontMetrics().stringWidth(productName1);
          int strWidth2 = outg.getFontMetrics().stringWidth(productName2);
          outg.drawString(productName1, 200 - strWidth1 / 2,
              image.getHeight() + (outImage.getHeight() - image.getHeight()) / 2 + 12);
          BufferedImage outImage2 = new BufferedImage(400, 485, BufferedImage.TYPE_4BYTE_ABGR);
          Graphics2D outg2 = outImage2.createGraphics();
          outg2.drawImage(outImage, 0, 0, outImage.getWidth(), outImage.getHeight(), null);
          outg2.setColor(Color.BLACK);
          outg2.setFont(new Font("宋体", Font.BOLD, 30)); //字体、字型、字号
          outg2.drawString(productName2, 200 - strWidth2 / 2,
              outImage.getHeight() + (outImage2.getHeight() - outImage.getHeight()) / 2 + 5);
          outg2.dispose();
          outImage2.flush();
          outImage = outImage2;
        } else {
          outg.drawString(productName, 200 - strWidth / 2,
              image.getHeight() + (outImage.getHeight() - image.getHeight()) / 2 + 12); //画文字
        }
        outg.dispose();
        outImage.flush();
        image = outImage;
      }
      logo.flush();
      image.flush();
      ByteArrayOutputStream baos = new ByteArrayOutputStream();
      baos.flush();
      ImageIO.write(image, "png", baos);

      //二维码生成的路径，但是实际项目中，我们是把这生成的二维码显示到界面上的，因此下面的折行代码可以注释掉
      //可以看到这个方法最终返回的是这个二维码的imageBase64字符串
      //前端用 <img src="data:image/png;base64,${imageBase64QRCode}"/>  其中${imageBase64QRCode}对应二维码的imageBase64字符串
      ImageIO.write(image, "png",
          new File("/Users/xiet/Pictures/123.jpg")); //TODO

      String imageBase64QRCode = Base64.encodeBase64URLSafeString(baos.toByteArray());

      baos.close();
      return imageBase64QRCode;
    } catch (Exception e) {
      e.printStackTrace();
    }
    return null;
  }


  /**
   * 构建初始化二维码
   */
  public BufferedImage fileToBufferedImage(BitMatrix bm) {
    BufferedImage image = null;
    try {
      int w = bm.getWidth();
      int h = bm.getHeight();
      image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

      for (int x = 0; x < w; x++) {
        for (int y = 0; y < h; y++) {
          image.setRGB(x, y, bm.get(x, y) ? 0xFF000000 : 0xFFCCDDEE);
        }
      }

    } catch (Exception e) {
      e.printStackTrace();
    }
    return image;
  }

  /**
   * 生成二维码bufferedImage图片
   *
   * @param content 编码内容
   * @param barcodeFormat 编码类型
   * @param width 图片宽度
   * @param height 图片高度
   * @param hints 设置参数
   */
  public BufferedImage getQRCodeBufferedImage(String content, BarcodeFormat barcodeFormat,
      int width, int height, Map<EncodeHintType, ?> hints) {
    MultiFormatWriter multiFormatWriter = null;
    BitMatrix bm = null;
    BufferedImage image = null;
    try {
      multiFormatWriter = new MultiFormatWriter();
      // 参数顺序分别为：编码内容，编码类型，生成图片宽度，生成图片高度，设置参数
      bm = multiFormatWriter.encode(content, barcodeFormat, width, height, hints);
      int w = bm.getWidth();
      int h = bm.getHeight();
      image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

      // 开始利用二维码数据创建Bitmap图片，分别设为黑（0xFFFFFFFF）白（0xFF000000）两色
      for (int x = 0; x < w; x++) {
        for (int y = 0; y < h; y++) {
          image.setRGB(x, y, bm.get(x, y) ? QRCOLOR : BGWHITE);
        }
      }
    } catch (WriterException e) {
      e.printStackTrace();
    }
    return image;
  }

  /**
   * 设置二维码的格式参数
   */
  public Map<EncodeHintType, Object> getDecodeHintType() {
    // 用于设置QR二维码参数
    Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
    // 设置QR二维码的纠错级别（H为最高级别）具体级别信息
    hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
    // 设置编码方式
    hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
    hints.put(EncodeHintType.MARGIN, 0);
    hints.put(EncodeHintType.MAX_SIZE, 350);
    hints.put(EncodeHintType.MIN_SIZE, 100);

    return hints;
  }
}

class LogoConfig {

  // logo默认边框颜色
  public static final Color DEFAULT_BORDERCOLOR = Color.WHITE;
  // logo默认边框宽度
  public static final int DEFAULT_BORDER = 2;
  // logo大小默认为照片的1/5
  public static final int DEFAULT_LOGOPART = 5;

  private final int border = DEFAULT_BORDER;
  private final Color borderColor;
  private final int logoPart;

  /**
   * Creates a default config with on color {@link #BLACK} and off color {@link #WHITE}, generating
   * normal black-on-white barcodes.
   */
  public LogoConfig() {
    this(DEFAULT_BORDERCOLOR, DEFAULT_LOGOPART);
  }

  public LogoConfig(Color borderColor, int logoPart) {
    this.borderColor = borderColor;
    this.logoPart = logoPart;
  }

  public Color getBorderColor() {
    return borderColor;
  }

  public int getBorder() {
    return border;
  }

  public int getLogoPart() {
    return logoPart;
  }
}